Polyurethane Tactile Film Surface Chemistry and Abrasion Dynamics
Polyurethane tactile films trade high material costs for self-healing elastomeric scuff resistance, requiring precise thermal nip control and high dyne levels.
Taber Abrasor
Rotational Friction
Mechanical wear resistance is evaluated for paperboard and coated packaging substrates by the taber abrasor through a controlled abrasive wheel system. A circular specimen undergoes continuous rotational contact against calibrated abrasive wheels under a fixed vertical load. Surface durability decreases as weight loss accumulates during standardized cycle intervals.
Board converters rely on this metric to specify protective coatings for high friction distribution channels where scuffing degrades exterior graphics.
Load Mechanics
Vertical pressure acts through two opposing weighted arms that press abrasive media downward against the rotating platform. Counterbalance weights apply loads typically set at standard increments of five hundred or one thousand grams. Each wheel travels along a tangential path relative to the specimen axis, generating a reciprocating scrub pattern that crosses all surface orientations uniformly.
Particle debris clears continuously from the testing track through a vacuum suction nozzle to prevent interference with abrasive contact.
Surface Endurance
Measured mass loss or visual haze degradation dictates the final wear index assigned to folding cartons and corrugated liners. Protective varnish layers must withstand specific cycle counts before substrate exposure compromises moisture barrier properties. Low resistance values force adjustments in coating weight or binder formulations during wet end operations.
High shear forces generated at the wheel interface simulate severe handling conditions encountered throughout retail supply chains.